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"From a user's perspective, you say I'm joining Facebook. I want my contacts. In Google, we said, fine. You can get them from Google.

"And the issue we had is that then Facebook said, no, Google, you can't do the reverse. And so we just said, well, users don't understand what they're doing. They're putting data in, and they don't understand they can't take it out.

"So we said, well, we'll only participate with people who have reciprocity. And we're still waiting."

Good luck with that. Since launching Google+ which is, essentially, GoogleBook, we can't see Zuck and friends falling over themselves to cooperate with the search company.